Had this occur in my recent load in. I'll work on uploading the log shortly. just posting as a means to remind myself

Sorry didn't get a log because I was not aware of this problem until after. A couple days ago I had this happen. I went upstairs and went to bed and when I came down I saw my surrvivor 'running on air', umoving. a big patch of blood was below them. I could not get them to respond to anything. I logged out and back in and the bloodspot was there but they were not. The 'u' menu showed them as deceased (I only had the one survivor). All they did was worked around the base (ie. not damaged or attacked from anything else). Based on the location and my going to sleep pretty sure if was this scenario that I have since been reading about happening.

Same thing happen to me... the only solution now is set base and guard area not near the stair